To obtain photopolymerizable composition which is bondable even after photoirradiation and provides a cured material having excellent elongation and adhesive strength.

The photopolymerizable composition comprises a cationic polymerizable compound, a photocationic polymerization initiator and a monofunctional vinyl monomer. The cationic polymerizable compound is obtained by mixing an epoxy resin containing two or more glycidyl groups in the monomer with an epoxy resin containing one glycidyl group in the molecule in the ratio of 100:10-100:150. The photopolymerizable composition is obtained by mixing 100 parts wt. of the cationic polymerizable compound with 5-30 parts wt. of the monofunctional vinyl monomer and has 20-95% gel fraction immediately after photoirradiation and the gel fraction reaches 60-100% after 24 hours by heating at 20-130°C after the photoirradiation. The photopolymerizable composition is irradiated with ultraviolet light and is used as an adhesive and a tackifier.